Question

我正在尝试绘制一个有多个孔的多边形。我尝试了以下代码，但它无法正常工作。请指教。

    PointF[] mypoly = new PointF[6 + 5 + 5];

    mypoly[0] = new PointF(0, 0);
    mypoly[1] = new PointF(100, 0);
    mypoly[2] = new PointF(100, 100);
    mypoly[3] = new PointF(0, 100);
    mypoly[4] = new PointF(10, 80);
    mypoly[5] = new PointF(0, 0);

    mypoly[6] = new PointF(10, 10);
    mypoly[7] = new PointF(10, 20);
    mypoly[8] = new PointF(20, 20);
    mypoly[9] = new PointF(20, 10);
    mypoly[10] = new PointF(10, 10);

    mypoly[11] = new PointF(40, 10);
    mypoly[12] = new PointF(40, 20);
    mypoly[13] = new PointF(60, 20);
    mypoly[14] = new PointF(60, 10);
    mypoly[15] = new PointF(40, 10);

    g.FillPolygon(new SolidBrush(Color.Red), mypoly, FillMode.Winding);

第一部分是外部多边形。第二和第三部分是多边形内的两个孔。

Answer 1

请改用GraphicsPath。您可以使用Graphics.FillPath绘制它，如下所示：

using System.Drawing.Drawing2D;
...
    using (var gp = new GraphicsPath()) {
        PointF[] outer = new PointF[] { new PointF(0, 0), new PointF(100, 0), 
            new PointF(100, 100), new PointF(0, 100), new PointF(10, 80),new PointF(0, 0) };
        gp.AddPolygon(outer);  
        PointF[] inner1 = new PointF[] { new PointF(10, 10), new PointF(10, 20), 
            new PointF(20, 20), new PointF(20, 10), new PointF(10, 10) };
        gp.AddPolygon(inner1);
        PointF[] inner2 = new PointF[] { new PointF(40, 10), new PointF(40, 20), 
            new PointF(60, 20), new PointF(60, 10), new PointF(40, 10) };
        gp.AddPolygon(inner2);
        e.Graphics.FillPath(Brushes.Black, gp);
    }

绘制有多个孔的多边形？

1 个答案: